Implement experimental file-based encrypted private chat

Add fixed-suite Rust/WASI identity files, signed challenge authentication, ciphertext-only SQLite storage, a minimal LibreJS-compatible interface, and consistent backup snapshots. Keep production unchanged and document the local workflow, limits, source distribution, and browser recovery tests.

1 files changed, 15 insertions, 3 deletions

diff --git a/crates/chat-crypto/src/main.rs b/crates/chat-crypto/src/main.rs
index b6749cf..9ecfe22 100644
--- a/crates/chat-crypto/src/main.rs
+++ b/crates/chat-crypto/src/main.rs
@@ -13,11 +13,23 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-#![doc = "Command entry point for the isolated cryptographic compatibility probe."]
+#![doc = "Isolated WASI command entry point for chat cryptography."]
 
-use std::io::{self, Write};
+use std::io::{self, Read, Write};
 
 fn main() -> io::Result<()> {
-    let result = stack_chat_crypto::compatibility_probe().map_err(io::Error::other)?;
+    let mut request = zeroize::Zeroizing::new(String::new());
+    io::stdin()
+        .lock()
+        .take(8_388_609)
+        .read_to_string(&mut request)?;
+    let result = if request.is_empty() {
+        stack_chat_crypto::compatibility_probe().map_err(io::Error::other)?
+    } else {
+        match stack_chat_crypto::dispatch(&request) {
+            Ok(output) => output,
+            Err(error) => serde_json::to_string(&serde_json::json!({"error":error}))?,
+        }
+    };
     writeln!(io::stdout().lock(), "{result}")
 }